html, body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Avenir, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  

  .container{
    width: 1400px;
    height: auto;
    margin: 0 auto;
  }


.page-enter-active,.page-leave-active{
    transition: opacity 1s;
}
.page-enter,.page-leave-active{
    opacity: 0;
}